原文∶ 有了几年的实际经验和理论学习，他的种菜水平逐渐得到提高。译文∶ His vegetable planting skill

原文∶ 有了几年的实际经验和理论学习，他的种菜水平逐渐得到提高。
译文∶ His vegetable planting skills have been gradually improved after years of practical experiences and theory learning.
【正确答案】：He has gradually improved his vegetable planting skills after years of practical experiences and theory learning. （考点∶主语的选择）